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Dyno Mite

Posted: Thu Aug 22, 2013 7:49 pm
by lb1731
I'm pretty new to the boat building scene. Looking to build a 11' Dyno Mite. Just wondering how some other builds have gone and what outboards people are running with them? What speeds are you attaining with those outboards? If I do the build I plan on running a Mercury Mark 30 inline 4 making 30HP. Any insight as to how fast I can get going with the motor would be helpful as well. I also plan on changing props to find the proper pitch to gain some extra speed. Any info would greatly be appreciated. Thank you for the help.

Re: Dyno Mite

Posted: Sun Aug 25, 2013 1:13 pm
by Mike Sea
Since the Dyno Mite and the Bullet are very similar boats only with different constructions methods, you should be able to come up with a speed estimate based on the results for the Bullet. Checkout Mark Finnila's build at http://www.glen-l.com/weblettr/weblette ... 126.html#X and Matt Heaney's Bullet in Photo Archives. Mark was running 29 mph with a 25 hp motor and Matt was running 35 mph with a 40 hp motor. Please note they were running new motors so the hp was rated at the prop shaft not the drive shaft, like your motor. Some time in the 1980's they made the change and the effect was in order to compare the old motor to the new motors the hp had to be reduced by 10 to 15 percent. By to days ratings the Mark 30 would be listed at 25 to 27 hp. So to answer your question, my guess is that a Dyno Mite with a Mark 30 should run 32 to 35 mph with one person in the boat. Keep in mind that speed props for the Mark 30 are hard to find, you may have to have a custom made prop.

Re: Dyno Mite

Posted: Mon Aug 26, 2013 4:45 pm
by lb1731
Mike Sea,

Thanks for the reply. Very helpful and informative. I really appreciate it. Really gives me some things to think about. That being said, I've seen some really nice builds of the TNT. My interest in the TNT has grown. Same length and same hull weight but looks like its made to move a little quicker with less of a pronounced vee. I've done some looking around and it seems like I'd be getting a more velocity with the TNT. Using the same Mark 30, how much difference between the DynoMite and the TNT is there going to be? Thanks in advance for any help and insight.

Re: Dyno Mite

Posted: Tue Aug 27, 2013 1:19 pm
by JasonG
As far as the majority of the build, the dyno-jet is the same boat as the dyno-mite. I have an active thread in the powerboat section and Speedy has an active thread in the Jet-ski power section.
That may give you and idea of the Dyno-mite build

Re: Dyno Mite

Posted: Wed Aug 28, 2013 8:35 am
by Mike Sea
The TNT should be faster than the DynoMite but the DynoMite should handle rough water better. So I would make my boat selection on where I plan to do most of my boating. I currently run a flat bottom runabout similar to a D class boat just a little bigger. On smooth to moderate chop I can run over 42 mph BUT when the water is rough (1 ft to 2ft chop) I have to back off on the speed and sometime have trouble staying on plan, because I don't like the boat to pound. Most of my boating is done on small lakes and rivers. My guess is TNT would be 2 to 4 mph faster on smooth water and maybe the same or slower in rough water.